How to Fullscreen Undertale on Lenovo
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Just hit F4 when you're in the game. No need for fancy tricks!
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Press F4. Boom, fullscreen magic!
F4 is the key. Literally!
ALT + ENTER does the trick to switch Undertale into fullscreen mode on Lenovo machines.
Try pressing Alt+Enter together while the game is running. Worked like a charm for me!
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